Method for treating wasterwater containing copper by utilizing Spartina alterniflora Loisel-based biochar

A technology of Spartina alterniflora and biochar, which is applied in the field of biomass resource utilization, can solve the problems of threatening indigenous species in coastal wetlands, affecting tidal flat farming, and the decline of coastal water quality, and achieves low requirements for adsorption and management conditions. The process is simple and easy, and the removal effect is high

Inactive Publication Date: 2012-07-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Spartina alterniflora was introduced to China in 1979. It played an important role in protecting beaches and embankments and promoting siltation and land formation. However, due to its strong fecundity in tidal flat wetl

Method used

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  • Method for treating wasterwater containing copper by utilizing Spartina alterniflora Loisel-based biochar
  • Method for treating wasterwater containing copper by utilizing Spartina alterniflora Loisel-based biochar
  • Method for treating wasterwater containing copper by utilizing Spartina alterniflora Loisel-based biochar

Examples

Experimental program
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Example Embodiment

[0031] Example 1

[0032] 1. Remove the roots of Spartina alterniflora, wash with distilled water, and air dry. The air-dried Spartina alterniflora stalks were cut into small sections of about 50 cm, and then placed in an oven to dry at 105°C, and then crushed with a pulverizer to obtain a powder of 50 mesh.

[0033] 2. The powder is placed in a tube furnace and heated to 300°C at a rate of 5°C / min under a nitrogen atmosphere of 100mL / min, and pyrolyzed at a constant temperature for 2h. Continue to pass 50 mL / min of nitrogen gas to cool to room temperature, grind, and pass through a 50-mesh sieve to obtain biochar. The yield was 43%.

[0034] 3. The prepared biochar can absorb the copper solution with a pH of 6±0.1 at a dosage of 2g / L, and the reaction time is 36 hours.

[0035] 4. Take part of the adsorbed suspension and filter, and measure its copper content by ICP.

[0036] The adsorption capacity of the biochar obtained from this embodiment for copper is 33.12 mg / g, and for a 10...

Example Embodiment

[0037] Example 2

[0038] Other conditions remain unchanged, and the pyrolysis temperature in Example 1 is changed to 400°C. The yield was 40%.

[0039] The biochar obtained in this example has a copper adsorption capacity of 48.49 mg / g at pH 6. When the biochar dosage is 2g / L, the removal rate of 100mg / L copper solution is 83%, and the removal rate of 50mg / L is more than 99%, reaching the first level emission standard ( <0.5mg / L).

Example Embodiment

[0040] Example 3

[0041] Other conditions remain unchanged, and the pyrolysis temperature in Example 1 is changed to 500°C. The yield was 39%.

[0042] The biochar obtained in this example has an adsorption capacity of 50.99mg / g for copper, a removal rate of 89% for a 100mg / L copper solution, and a removal rate of over 99% for 50mg / L, which is close to complete removal, reaching the first level Emission Standards.

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Abstract

The invention discloses a method for treating wasterwater containing copper by utilizing Spartina alterniflora Loisel-based biochar, belonging to the field of resource utilization of biomass. The method comprises the following steps: 1) removing roots of Spartina alterniflora Loisel, cleaning, airing, then completely stoving and smashing; 2) pyrolyzing Spartina alterniflora Loisel power at a temperature of 300-550 DEG C for 1-4 hours under the protection of N2, cooling to room temperature, and grinding and screening, wherein the productivity is 39-43%; and 3) adding the prepared biochar into the wastewater containing copper according to a proper proportion, and treating for 6-48 hours, wherein the adsorption quantity of copper is 33.12-50.99%. The biochar prepared by the method is low in cost, simple in operation and high in adsorption quantity, so that good environment, social benefit and considerable economic benefit can be created.

Description

technical field [0001] The invention relates to a preparation method of Spartina alterniflora-based biochar and its treatment of copper-containing wastewater, belonging to the field of resource utilization of biomass. Background technique [0002] Chemical industry, electroplating, non-ferrous smelting, printing and dyeing, mining, dye production, electronic material rinsing wastewater and other processes often produce wastewater containing a large amount of copper ions. If this wastewater is discharged into the water body, it will seriously affect the water quality, cause the water body to emit peculiar smell, and inhibit the self-purification of the water body capacity, making water undrinkable, and causing harm to environmental quality and human health. Adsorption is an important method for removing heavy metals. Activated carbon and biosorbents are currently commonly used biomass-based adsorbents for removing heavy metals. Due to the expensive raw materials and producti...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/62
Inventor 刘强郭丽晶张亚萍郑燕贾泽奇冯淋淋
Owner SHANGHAI UNIV
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